AS50205: the BFNASYS network

Equipe PC Monitor · Atualizado em 19/09/2026

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AS50205 is an internet Autonomous System operated by BFNASYS (BY). Here is what that means and why this number may show up when you investigate a connection on your network.

What is AS50205?

An Autonomous System (ASN) is a block of networks under a single control with its own routing policy on the internet. The number AS50205 was assigned to BFNASYS by an RIR (regional internet registry). All traffic entering or leaving that network is announced under this number.

Reach on the internet

AS50205 currently announces 1 IPv4 block(s), totaling 256 addresses (256 in all), registered in BY. Services from BFNASYS are reached through these addresses.

What it means to see AS50205 on your network

When you investigate where a connection from your computer or phone comes from (or goes to), you may find AS50205. That means the other end sits on the BFNASYS network (BY). It can be legitimate — a cloud service, an ISP, a CDN — or an unexpected connection worth checking.

How to see every connection and network your devices reach

Tracing one connection's ASN at a time is tedious. Sentinela, by PC Monitor, maps the devices on your network, shows what is exposed to the internet and helps flag suspicious connections and devices — running on your Windows. Meet Sentinela.

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Perguntas frequentes

Who owns AS50205?

AS50205 is assigned to BFNASYS, registered in BY.

What is an ASN (Autonomous System)?

It is a unique number identifying a network with its own routing policy on the internet. RIRs (regional registries) assign these numbers to carriers, ISPs and companies.

How many IP addresses does AS50205 control?

AS50205 currently announces 256 routed IPv4 addresses.

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